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  2. AT&T Michigan Headquarters - Wikipedia

    en.wikipedia.org/wiki/AT&T_Michigan_Headquarters

    The AT&T Building (formerly known as the SBC Building, the Ameritech Building and the Michigan Bell Building) was completed for the Michigan Bell Telephone Company in 1919 [1] and expanded in 1928. It is located at 1365 Cass Avenue, and occupies the block bordered by First Street, Cass Avenue, State Street, and Michigan Avenue .

  3. History of AT&T - Wikipedia

    en.wikipedia.org/wiki/History_of_AT&T

    The history of AT&T dates back to the invention of the telephone. The Bell Telephone Company was established in 1877 by Alexander Graham Bell, who obtained the first US patent for the telephone, and his father-in-law, Gardiner Greene Hubbard. Bell and Hubbard also established American Telephone and Telegraph Company in 1885, which acquired the ...

  4. Michigan Bell - Wikipedia

    en.wikipedia.org/wiki/Michigan_Bell

    Michigan Bell is the subsidiary of AT&T serving the state of Michigan. Following the Bell System divestiture on January 8, 1984, the company became a subsidiary of Ameritech, the Regional Bell operating company that served the midwestern United States. Ameritech was subsequently acquired by SBC Communications, which later changed its name to AT&T.

  5. Area code 269 - Wikipedia

    en.wikipedia.org/wiki/Area_code_269

    Area code 269 is the telephone area code serving the southwest portion of Michigan's Lower Peninsula. [1] ... Frontier and AT&T are the predominant local telephone ...

  6. Telephone exchange names - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange_names

    Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]

  7. Original North American area codes - Wikipedia

    en.wikipedia.org/wiki/Original_North_American...

    The original North American area codes were established by the American Telephone and Telegraph Company (AT&T) in 1947, after the demonstration of regional Operator Toll Dialing during the World War II period. The program had the goal of speeding the connecting times for long-distance calling by eliminating intermediary telephone operators.

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